<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>页面结构分析</title>
</head>
<body>
<header><h2>网页头部</h2></header>

<section><h2>网页主题</h2></section>

<footer><h2>网页脚步</h2></footer>
</body>
</html>